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Simplify Factorial Equations

equation.bmp
A. (n-1)(n-2)(n-3)
B. (n-1)(n-2)(n-3)(n-4)
C. (n)(n-1)(n-2)(n-3)
D. (n-2)

In order to solve this question we must first expand the equation as far as possible or needed. This is one of the possibilities one must use to complete.

solving.bmp

By expanding the equation only to 4! we are able to cancel out the (n-4)! on both the numerator and denominator, leaving us with the answer to our question:

answer.bmp

After all these steps have been completed you have now learned how to simplify factorial expressions! :)